Spark plug



March 9 1926. 1,576,176

H. E. COREY S PARK PLU 6 Filed March 10, 1924 Patented Mar. 9, 1926.

UNITED s'ra'rns PATENT OFFICE.

SPARK PLUG.

Application filed March 10, 19-24. fierial No. 698,043.

To all whom it may concern:

Be it known that I, HAnMoN E. COREY, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Spark Plugs, of which the following is a specification.

This invention relates to spark plugs and ithas for one of its objects the provision of a spark plug which will effect a more complete combustion of fuel .in internal coml ustion engines.

Another object of this invention is the provision of a spark plug having a plurality of spark gaps in series.

A further object of this invention is the provision of a spark plug capable of. giving a more efficient spark.

With the foregoing objects in view, to gether with such other objects and advantages as may subsequently appear, my invention resides in the construction and ar- 'angement of parts hereinafter described and claim-ed and illustrated in the accompanying drawings, in which:

Figure 1 is an elevational View, partly in section, of a spark plug embodying my invention, and

Fig. 2 is a bottom plan view of Fig. 1.

Referring to the drawings for a more do tailed description thereof, the numeral 5 indicates a spark plug having the usual central electrode 6, the upper end of which is designated by 6. The spark plug 5 is of usual construction excepting only the electrode which cooperates with the central electrode 6 and the novel part-s associated with the former electrode. The electrode which cooperates with the central electrode 6 is adapted as usual to be connected to a source of electric current and comprises .two branches 7 and 8 respectively, the opposing ends of which are separated by a space 9. insulating material 10 is placed around the end portions of the branches 7 and 8 and extends across the space 9. An electrical conductor 12 is placed on, and preferably around, the insulating material 10, so that part of the conductor 12 is between the central electrode 6 and the other electrode comprising branches 7 and 8.

In the operation of this spark plug, a spark jumps from the electrode 6 to the conductor 12 and thence to the branch 7 or 8 of the otherelectrode. It will thus be seen that there is a plurality of spark gaps in series in the device of my invention and it is this feature that effects a more complete COR'LbEStlOH of the gasoline or other fuel.

l urtherinore, actual use of my device has shown that the sparks provided by my device are more efficient than the sparks provided by other spark plugs operating under the same conditions under which I have tested the spark plug of my invention.

I have thus provided a spark plug having a plurality of spark gaps in series and comprising two electrodes adapted to be connected to a source of electric current, insulating material on one of the. electrodes, which preferably consists of two branches, and an electrical conductor around the insulating material, the electrical conductor being interposed in part between the two electrodes. 1

While I have herein described one form of myinvention, modifications thereof may be devised without departing from the spirit thereof, and it is to be understood that such modifications come within the scope of this invention.

lVha-tis claimed is:

A spark plug having a central electrode, a pair ofelectrodes constituting a second electrode disposed beneath said central electrode and having opposed ends, a sleeve of insulating material mounted upon said opposed ends, and a sleeve of conducting material'about said sleeve of insulating material, said conducting material being held in spaced relation to-said central electrode.

In testimony whereof I have signed my name to this specification.

HARMON E. COREY. 

